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Endothelial dysfunction in salt-sensitive essential hypertension.

E Bragulat1, A de la Sierra, M T Antonio

  • 1Hypertension Unit, Department of Internal Medicine, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Hospital Clínic, Barcelona, Spain.

Hypertension (Dallas, Tex. : 1979)
|March 7, 2001
PubMed
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Salt-sensitive hypertension is linked to impaired endothelium-dependent vasodilation, suggesting a defective nitric oxide pathway. This endothelial dysfunction may contribute to higher blood pressure in salt-sensitive individuals.

Area of Science:

  • Cardiovascular Physiology
  • Renal Physiology
  • Endocrinology

Background:

  • Essential hypertension is a complex condition with varying responses to dietary salt.
  • Salt sensitivity in hypertension is associated with increased cardiovascular risk.
  • Endothelial dysfunction plays a critical role in the pathophysiology of hypertension.

Purpose of the Study:

  • To investigate endothelial function and biochemical markers in salt-sensitive versus salt-resistant hypertensive patients.
  • To assess the impact of high salt intake on vasodilation and nitric oxide pathway markers.

Main Methods:

  • Forearm blood flow was measured using strain-gauge plethysmography during infusions of acetylcholine, sodium nitroprusside, and N(G)-monomethyl-L-arginine (L-NMMA).
  • Plasma and urinary concentrations of nitrates, cyclic guanosine monophosphate (cGMP), and endothelin were analyzed.

Related Experiment Videos

  • Patients were classified as salt-sensitive or salt-resistant based on blood pressure changes during high salt intake (250 mmol/d) and low salt intake (50 mmol/d).

    • Main Results:

    • Salt-sensitive hypertensive patients exhibited significantly lower maximal acetylcholine-induced vasodilation compared to salt-resistant patients.
    • No significant difference in maximal sodium nitroprusside-induced vasodilation was observed between the groups.
    • High salt intake led to a significant decrease in urinary nitrate excretion in salt-sensitive individuals, unlike in salt-resistant ones.

    Conclusions:

    • Salt-sensitive hypertension is characterized by endothelial dysfunction, specifically impaired endothelium-dependent vasodilation.
    • The L-arginine-nitric oxide pathway appears to be compromised in salt-sensitive hypertension.
    • These findings highlight a potential mechanism linking salt intake, endothelial function, and blood pressure regulation.